/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.sdk.extensions.sql.impl.rule;



import com.bff.gaia.unified.sdk.extensions.sql.impl.rel.UnifiedJoinRel;

import com.bff.gaia.unified.sdk.extensions.sql.impl.rel.UnifiedLogicalConvention;

import org.apache.calcite.plan.Convention;

import org.apache.calcite.rel.RelNode;

import org.apache.calcite.rel.convert.ConverterRule;

import org.apache.calcite.rel.core.Join;

import org.apache.calcite.rel.logical.LogicalJoin;



/** {@code ConverterRule} to replace {@code Join} with {@code UnifiedJoinRel}. */

public class UnifiedJoinRule extends ConverterRule {

  public static final UnifiedJoinRule INSTANCE = new UnifiedJoinRule();



  private UnifiedJoinRule() {

    super(LogicalJoin.class, Convention.NONE, UnifiedLogicalConvention.INSTANCE, "UnifiedJoinRule");

  }



  @Override

  public RelNode convert(RelNode rel) {

    Join join = (Join) rel;



    return new UnifiedJoinRel(

        join.getCluster(),

        join.getTraitSet().replace(UnifiedLogicalConvention.INSTANCE),

        convert(

            join.getLeft(), join.getLeft().getTraitSet().replace(UnifiedLogicalConvention.INSTANCE)),

        convert(

            join.getRight(), join.getRight().getTraitSet().replace(UnifiedLogicalConvention.INSTANCE)),

        join.getCondition(),

        join.getVariablesSet(),

        join.getJoinType());

  }

}